VirtualBox VM only use 1 cpu

[jae]

I have VB running on my headless Debian home server. All my VMs are set to use 2 cpus but in their System Monitor/htop/Task Manager it only shows one. I cant figure out why. ....Help!?


Memory size: 3000MB
Page Fusion: off
VRAM size: 256MB
CPU exec cap: 100%
HPET: off
Chipset: piix3
Firmware: BIOS
Number of CPUs: 2
PAE: on
Long Mode: on
Synthetic CPU: off
CPUID overrides: None
Boot menu mode: message and menu
Boot Device (1): Floppy
Boot Device (2): DVD
Boot Device (3): HardDisk
Boot Device (4): Not Assigned
ACPI: on
IOAPIC: off
Time offset: 0ms
RTC: local time
Hardw. virt.ext: on
Nested Paging: on
Large Pages: off
VT-x VPID: on
VT-x unr. exec.: on

 

[TheRyuu]

Run:

uname -a

Do you have a SMT enabled kernel?

 

[jae]

Linux redbox 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64 GNU/Linux

 

[TheRyuu]

Linux redbox 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64 GNU/Linux

Just to double check but that's from in the guest right?

Also I just noticed this:

...
IOAPIC: off
...

Pretty sure you need I/O APIC for >1 guest CPU's.

 

[Scarpozzi]

Just to double check but that's from in the guest right?

Also I just noticed this:


Pretty sure you need I/O APIC for >1 guest CPU's.

On Ubuntu, I have a Windows 7-64bit VM....To even get it to install, I had to run ICH9 chipset and Enable I/O APIC.

I've also got Enable VT-x/AMD-V and Nested Paging checked.

 

[jae]

Just to double check but that's from in the guest right?

Also I just noticed this:


Pretty sure you need I/O APIC for >1 guest CPU's.

On Ubuntu, I have a Windows 7-64bit VM....To even get it to install, I had to run ICH9 chipset and Enable I/O APIC.

I've also got Enable VT-x/AMD-V and Nested Paging checked.

Thats from the host.
Ahh didn't notice that. I'll have to look up the VBoxManage command to enable that.

 

[TheRyuu]

Thats from the host.
Ahh didn't notice that. I'll have to look up the VBoxManage command to enable that.

The relevant documentation.